Where did you get that? Did you search the area or something in a bar?
Anways, battle in UD is all about percentage. The higher your attack percentage, the more likely it is for you to score a hit. Buying new skills with the Exp you earn from doing various things can help to increase that percentage. Just keep trying, and you'll eventually kill one. But be wary of your draining AP, as getting stuck outside ensures your death and transformation into a zombie. You can go to a cemetery to get revived, but it's just a pain, so avoid it.
I could weaken a couple zombies for you, then let you finish them off. We both would get Exp that way. Unfortunately, I'm coming to you with my lowest level character, because he's the only one not involved in something.
So yeah, we should just seek out zombies and tag team for easy experience. Then, once we're higher level, we may want to become a bounty hunter duo, as that would be fun. We can collect the bounties on Player Killers (Survivors who kill other survivors), or particular zombie threats.
How does this sound to you?